Sewing-machine shuttle



L. E. WEAVER. SEWING MACHINE SHUTTLE. APPLICATION HLED'JULY 8. i9l9- 1,386, 146. Patented Aug. 2, 1921.

v in azJusZT Ma/ver #350770 ey-s UNITED STATES PATENT OFFICE.

LUCIUS E. WEAVER, OF EAST HAMPTON, CONNECTICUT, ASSIGNOR TO SUMMIT THREAD COMPANY, OF EAST HAMPTON, CONNECTICUT, A CORPORATION OF MAINE.

SEWING-MACHINE SHUTTLE.

Application filed. July 8, 1919.

T 0 all 'w/wmit may concern i Be it known that I, Looms E. \Vnavnn, a citizen of the United States, residing 'at East Hampton, in the county of Middlescx and State of Connecticut, have invented new and useful Improvements in Sewing-Machine Shuttles, of which the following is a specification.

This invention relates chiefly to a rotary shuttle for an inseam sewing or stitching machine used in forming the inseam stitches of shoes, the shuttle being formed'to rotate in a shuttle race and provided with a boblVhen the bobbin is partly spent the convo lutions of thread comprising the central portion of the winding are liable to be laterally displaced and caught in such manner as to prevent or impede the rotation of the bobbin. In consequence of this liability it is customary to inclose the bobbin in a case inserted with the bobbin in the chamber and rotatable on the stud with the bobbin, the sides of the case bearing on the sides of the bobbin, and preventing the displacement of the convolutions. The case occupies so much of the chamber that the yardage or length of thread composing the winding is necessarily less than it would be if the case were eliminated, so that more frequent replenishment is required.

My invention has for its object to eliminate the bobbin case, and to substitute therefor a device accomplishing the same purpose without reducing the thread-containing capacity of the chamber.

The invention is embodied in the improvements which I will now proceed to describe and claim.

Of the accompanying drawings forming a part of this specification,--

Figure l is a. top plan view of a shuttle Specification of Letters Patent.

Patented Aug. 2, 1921.

Serial No. 309,412.

embodying the invention, and a bobbin eonfined therein.

Fig. 2 is a section on line 2-2 of Fig.1, andan edge view of the bobbin.

F 1g. 3 is a perspective view of the shuttle, the confining arm being displaced.

Fig. 1 is a sectional view of the bobbin.

The shuttle shown by the drawings, excepting the resilient. finger hereinafter described, is of well known construction and is not claimed by me. It is provided with an arcuate rib or flange 12, adapted to run in ashuttle race, a recess 13 interrupting the continuity of the flange, a beak 14 at one end of said recess, a bobbin chamber 15 adjacent to the recess, a stud 16 in said chamber on which a universally wound bobbin is rotatable, and a confining arm 17 hinged by a pin 19 to the shuttle, and adapted to extend across the chamber, as shown by Figs. 1 and 2, when in its operative position, and to be displaced, as shown by Fig. 3. The bottom of the bobbin chamber surrounds the stud 16 and supports the inner end of the bobbin, as shown by Fig. 2.

The arm 17 is provided with a shank at its hinged end having faces 21 and 22, which are engaged by a spring-pressed member 23 to yield'ingly hold the arm in each of the two positions shown, and prevent the arm from swinging loosely from either position, and to be shifted from either position to the other. The free end of the arm is bent to form a projection 24 which enters an orifice 25 in the shuttle when the arm is in its operative position.

As shown by Fig. 4:, the bobbin is composed of a cop tube 26, and a winding 27 of thread thereon.

Heretofore the arm 17 has been employed to confine in the chamber 15 a bobbin case inclosing the bobbin, the case being formed to rotate with the bobbin on the stud.

In carrying out my invention, I attach to the arm 17 by means such as rivets 28, a resilient finger 29, preferably composed of a thin strip of steel. The finger is attached to the arm at one end portion only, its opposite end portion being offset from the arm and formed and arranged to bear yieldingly on the central portion of the outer side of the thread winding 27, as indicated by Figs. 1 and 2, when the arm 17 is in its 0perative position. The outer end of the finger is preferably provided with an opening 30, arranged to receive the outer end of the stud 16, so that the arm has a bearing on an annular portion of the thread windin this hearing being sufficient to prevent the lateral displacement of the convolutions of the thread ofha partly or nearly spent bobbin. The inner side of the bobbin is pressed by the fin er against the bottom of the chamber 15. 'The opening 230 permits the finger to spring inward from the position shown by Fig. 2, as the length of the bobbin decreases.

It will be seen that before thread has been withdrawn from the bobbin, the linger 29 occupies no space in the chamber 15, so that the bobbin may, if desired, be of such dimensions that it will practically fill the chamber.

I claim:

A shuttle having a bobbin chamber, a stud in said chamber on which a universally wound bobbin is rotatable, the chamber being provided with an internal iace surrounding the stud and supporting an end of the bobbin, a bobbin-confining arm hinged to the shuttle and extending across the chamber when in operative position; and a resilient finger attached at one end to said arm, and formed at its opposite end to bear yieldingly on the central portion of theouter end of the-bobbin when the arm is in its operative position, and prevent (lisplacement of the inner convolutions of thread when the bobbin is partially spent, said finger being provided with an opening which receives the outer end of the stud whenthe finger is in its operative position, whereby the finger is enabled to spring inwardly toward said internal face as the length of the bobbin decreases. 1

In testimony whereof I have atiixed my signature.

LUUIUS E. WEAVER. 

